Question: Let and . Prove that and .(Hint: for , you must show that is an upper bound and there is no smaller upper bound; for

Let and . Prove that and .(Hint: for , you must show that is an upper bound and there is no smaller upper bound; for , you must show that is a lower bound and there is no greater lower bound. See definition 1.8.) For this DQ, you must provide a formal proof in 3 columns.

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